### What problem does this PR solve?
feat: Add hint for operators, round to square, input variable, readable
operator ID. #3056
### Type of change
- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):
### What problem does this PR solve?
feat: modify DuckDuckGo's style #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: add duckduckgo icon #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: add icon to graph nodes #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
